When building your cage, just make sure that you keep ventilation to a minimum. To keep humidity up, you have to reduce air exchange. Of course you still need to let some air get in your cage, but not very much. Most screen-topped cages are poor for holding moisture for that reason - too much airflow. Only small vent areas are needed to let in enough fresh air for your snake to be healthy.

Having heat lamps or ceramic heat emitters to heat a cage can cause a reduction in moisture as well, better to use heat pads, heat tape, or heat cable, which don't "bake" away moisture. Heat lamps and CHEs usually need ventilation anyway to avoid fire hazards, which make them very hard to use with high-humidity setups.

A cage that holds humidity well should only need to be misted once every day or every other day. Consider using a humid hide (a tupperware or other plastic box with a hole in the side to allow your snake to get in, with damp sphagnum moss inside). This will help your snake shed.
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Lauren Madar
www.ophidiagems.com
1.1 Hog Island Boas
1.1 Hypo BCI
0.1 Sorong-type GTP
1.0 Normal Ball Python
1.1 Surinam BCC

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